LoongArch: Don't write into GOT for local ifunc

LoongArch: Don't write into GOT for local ifunc

Local ifuncs are always resolved at runtime via R_LARCH_IRELATIVE, so
there is no need to write anything into GOT.  And when we write the GOT
we actually trigger a heap-buffer-overflow: If a and b are different
sections, we cannot access something in b with "a->contents + (offset
from a)" because "a->contents" and "b->contents" are heap buffers
allocated separately, not slices of a large buffer.

So stop writing into GOT for local ifunc now.